Motion-amplifying device



Sept. 14 1926. K

- c.- E. P. GouRDou MOTION AMPLIFYING' DEVICE Filed May 5 1924 A l /NVENTQR (Zay-Ja: filmar] .Z'erfa aafau( ATTURJVEV meter thickness), 'serles of pills d, e, f,

tachment; andor Slide h; fastened to .a stationary frame b.

`Patented Sept. 14, 196.

'UNITED ySTATES `pitflua-trlf oFQFlcE.

MOTION-AMPLIIYIN-G DEYICE.

Applicationlled May 5, 1924,' Serial No. 711,215, and-1n France Hay 16, 1923.-

The o bject of this invention 'is to provide an improved motion-amplifying device ,which is applicable generally to any and gall apparatus/in which.thv-displacement of a movable part 0r member -isfto be'measured, but Vwhich is specially applicable to vregistering barometers.

The device according to my invention consists essentially of a ilexible blade or wirevsultably wound around and tensioned on :pms or studs carried by a movable tat- Atachment, one end of 'which blade is 'securedto the vpart whose displacement'is'to be measured, while its other end is-secured to a stationary frame. The movable attachment carries a 4pointer that indicates or. registers the displacements of the movable end of the blade, and said atachment is Asubjected to the action of an adjustable .spring which opposes or resists the movementl there- 0f :and which is fastened at opposite ends to the attachment and to the stationary frame.

In the accompanying drawings Flgure 1 is a diagrammatic side elevation of the complete invention; v Fig. 2 is an enlarged detail view, illustrating the winding of the flexible blade or wire around the pins carried by the movable attachment; v

Fig. 3'is a detail view ofthe aforesaid at- Fi 4 is a view of a justing the resistance spring of the device.

Referring to Fig- 1, a indicates a set of aneroid vessels. connected together in superposed relation, the under wall of the lower vessel being secured to a frame b. The top wall of the upper vessel serves as an attaching point for one endof a flexible bladey c (for instance, a steel band of .04 milliwhich is wound around a g carried by and se- .set into'a small movable attachment the other end of the blade being curel The attachment or slide h, as shown in Fig. 3, consists of aU- haped strip4 of sheet metal, the two opposite faces of the U being provided with holes to receive the pin ends. In themean or normal position of this member, the pins d and. g will be disposed in a horizontal line (as will be apparent from while pins e and f will be disposed in an oblique hne which is 'so positioned as to permit the blade to pass freely 'between showing a possible method;

'the lower end z" the first-named pins. Due to'this arrangement, the attachment will'beheld onblade movement thereof' along the blade 'being possible as soon asc without any sliding the tension exerted on the blade is sufficient, -the arcs of vwinding -beingof considerable extent. Incase a'wire-is used,"insteadof a the displacements ofthe 'movable end ofthe blade; the. amplification ratio, in mean posi tion ofthe parts, being equal to the ratiQ between the-length of thefpointer and the inside distance between pins n l scale referred tdmay take the. form ofl a drum whereon the pointer records its movements, or it may consist of agraduated dial, in front of which thev pointer moves, the precise character-of the scale to the invention itself. y

To reduce-friction between the side and its resistance sprin i asfar as. possible, the bottom of the ormer may be suitably rounded, as indicatedat lc in Fig.' 3, and

of the spring may flattened into a very thin blade (Fig. 4) which is wound around the saidrounded portion k. The length of the spring maybe adjusted b means of al small U-shaped metal memv er v -having ahole 'in one arm thereof through which one end of the spring is inserted; the other arm of said memberR .being introduced between two spires of the spring. By turning this member /v more or less around the spring, a greater or lesser number of spires ofv the spring 'can be brought i'nto operation. Tensioning of the spring can be effected by means of a. nut Z (Fig. 4:) on its threaded, non-flattened end., said nut bearing against a washer Z supported on the-stationary frame b.

The above-described device is applicable to all measuring apparatus, where the displacement of a movable part of member (in the present instance, the top wall of the several times around the two pinsd meansvof a Vloop or eye 1n the d and g.. The

being immaterial upper aneroid vessel a) is to be measured. Obviously both ends of blade c might be lmovable, and in that event the pointer would such movement; al support to which thd other end of said elementis connected; a member movably mountedon theflexible element intermediate the' ends thereof and provided with .an indicater, said member`adapted to turn relatively to said element consequent upon the stressing of the latter; and ,a spring connected tos'aid member to oppose such turning movement.

2. Apparatus for measuring the extent of movement of `a moving p`art,comprising a flexible element connectedat one end to the part whose movement is to bemeasured, so as to be directly and positively stressed by such movement; a support to which the other end of said `element is connected; a member movable mounted on the flexible element and provided with a set of ypins around which saidelement is wound intermediate its ends, and also provided with an indicator, said member adaptedto be turned relatively to said element bythe acti-on of the vlatter on said pins consequent upon its being stressed; anda spring connected to saidlmember tooppose such turning .move ment. 3. Apparatus for measuringthe extent of movement of a. moving part, comprising a flexible element connected at one end to the moving part; a support to which the other end of said element is connected; a U- shaped attachment movably mounted on the flexible element and having a set-of pins disposed transversely between its sides, around yed in'spaced, horizontal relation, the other two being disposedy in anv oblique line which passes through` the space between the first, two. j im` v5. Apparatus for measuring the extent of movement of a moving part, comprising'a 4flexible element connected at one end to the part whose movement is to be measured, so as to be directly and positively stressed by such movement a support towhich the other end of said lelement 1s connected; a member movably mounted on the iexible element intermediate the ends thereof and provided with an indicator, said member adapted to rotate relatively to said element consequent upon thestressingof the latter and having a portion thereof lwhich. is'engaged by 'said element rounded to prevent slippage be tween said parts and to permit such rotation lWithout friction; and a spring connected to oppose said rotation.

6. Apparatus for measuringthe extent of movement of a moving part, comprising a flexible element connected at one end to ^the moving part; a support towhich the other end of said elementis connected; a member movably mounted on the flexible elementand provided with a set of pins around which said zelement is wound inter-- mediate vits ends, said member adapted tol rotate relatively to said element during the movement of said movable part and having a portion thereof which is engaged by said element rounded to prevent'slippage between' said parts and to permit such rotation without friction; a pointer 'carried' by said. member; and a spring connected to oppose said rotation.

In testimony whereof I have aixed my.

signature.`

. CHARLES EDOUARD PIERRE G0URD0U.l 

